Fix: [Cygwin] Fix missing definitions in stdafx

Fix the following compile errors:

In file included from openttd/src/debug.h:15:0,
                 from openttd/src/string.cpp:13:
openttd/src/cpu.h:35:19: error: 'uint' was not declared in this scope
 bool HasCPUIDFlag(uint type, uint index, uint bit);

openttd/src/string.cpp: In function 'char* strcasestr(const char*, const char*)':
openttd/src/string.cpp:548:7: error: 'strncasecmp' was not declared in this scope
   if (strncasecmp(haystack, needle, needle_len) == 0) return const_cast<char *>(haystack);

openttd/src/strgen/strgen_base.cpp: In function 'void EmitPlural(Buffer*, char*, int)':
openttd/src/core/alloc_func.hpp:136:6: error: 'alloca' was not declared in this scope
  (T*)alloca((num_elements) * sizeof(T)))

Signed-off-by: Joe Stringer <joe@wand.net.nz>

src/stdafx.h

@@ -21,7 +21,10 @@
 	#include <unistd.h>
 	#define _GNU_SOURCE
 	#define TROUBLED_INTS
-	#include <strings.h>
+#endif
+
+#if defined(__HAIKU__) || defined(__CYGWIN__)
+#	include <strings.h> /* strncasecmp */
 #endif
 
 /* It seems that we need to include stdint.h before anything else
@@ -98,7 +101,7 @@
 	#define strcasecmp stricmp
 #endif
 
-#if defined(SUNOS) || defined(HPUX)
+#if defined(SUNOS) || defined(HPUX) || defined(__CYGWIN__)
 	#include <alloca.h>
 #endif
 
@@ -137,7 +140,7 @@
 	#include <malloc.h>
 #endif /* __WATCOMC__ */
 
-#if defined(__MINGW32__) || defined(__CYGWIN__)
+#if defined(__MINGW32__)
 	#include <malloc.h> // alloca()
 #endif
 
@@ -305,7 +308,7 @@
 typedef unsigned char byte;
 
 /* This is already defined in unix, but not in QNX Neutrino (6.x)*/
-#if (!defined(UNIX) && !defined(__CYGWIN__) && !defined(__HAIKU__)) || defined(__QNXNTO__)
+#if (!defined(UNIX) && !defined(__HAIKU__)) || defined(__QNXNTO__)
 	typedef unsigned int uint;
 #endif